重组人生长激素对荷人胃癌裸鼠移植瘤血管内皮生长因子表达的影响

目的研究重组人生长激素（rhGH）对生长激素受体（GHR）不同表达状态裸鼠人胃癌移植瘤生长及血管内皮生长因子（VEGF）表达的影响。方法采用免疫细胞化学染色法筛选出GHR阳性和阴性表达的细胞株各1株，分别接种于24只裸鼠皮下。将两种细胞接种裸鼠均随机分为对照组（0．9％NaCl，0．2ml／d）、低剂量rhGH组（0．5U·kg^-1·d^-1，0．2ml／d）和高剂量rhGH组（2．5U·kg^-1·d^-1，0．2mL／d）3组，每组8只，各组均连续给药14d，观察并记录裸鼠体重和肿瘤体积变化；采用酶联免疫吸附法测定各组裸鼠血清VEGF含量，免疫组织化学方法检测胃癌组织中VEGF蛋白表达，RT-PCR方法检测胃癌组织VEGFmRNA水平变化。结果筛选出GHR阳性表达的人胃癌细胞株SGC-7901和阴性表达的MKN-45。对于GHR^＋SGC-7901接种裸鼠，rhGH给药组皮下移植瘤体积较对照组增大（P〈0．05），且高剂量rhGH组促增长效应最为显著（P〈0．05），3组间体重差异无统计学意义（P〉0．05）；高剂量rhGH组的血清VEGF浓度为（252．94±15．32）ng／L，明显高于对照组的（49．94±5．73）ng／L和低剂量rhGH组的（167．60±9．54）ng／L（P〈0．05）；对照组VEGF表达为中度阳性，rhGH给药组呈强阳性；高剂量rhGH组肿瘤组织中VEGFmRNA相对表达量为0．6470±0．0447，明显高于对照组的0．3230±0．0258和低剂量rhGH组的0．4120±0．0351（P〈0．05）。对于GHR—MKN-45接种裸鼠，rhGH给药组体重明显大于对照组（P〈0．05）；肿瘤体积大小、血清VEGF水平、肿瘤组织VEGF蛋白及mRNA表达，3组间差异均无统计学意义（P〉0．05）。结论rhGH能促进GHR阳性表达的SGC-7901移植瘤生长，并促进VEGF表达增高；对于GHR阴性的MKN-45移植瘤，则没有表现出明显的促肿瘤生长及促VEGF表达效应。GHR存在可能是rhGH影响VEGF分泌的关键靶点。     

Copper,Zinc and Lead Enrichments in Sediments from Guacanayabo Gulf,Cuba, and Its Bioaccumulation in Oysters,Crassostrea rhizophorae

Levels of iron, copper, zinc and lead were determined in sediments and soft tissue of the oyster Crassostrea rhizophorae collected from Guacanayabo Gulf, Cuba. Metal-to-Iron ratio in sediments shows an average enrichment for Cu (5,1), Pb (11,7) and Zn (1,3) in the last 20 years. Metal concentrations found in soft tissue of C. rhizophorae are site dependent. The average biota-sediment accumulation factors (BSAFs) obtained for Fe, Cu and Pb are less than unity in all cases, indicating that only a little fraction of Cu and Pb in the sediments is bioavailable, independently of their enrichments. Zinc has an average BSAF value of 2.4 and may represent a serious impact in the area. The concentrations of zinc and copper in some of the oysters are above typical public health recommended limits.     

46例首诊伴远处转移鼻咽癌的预后分析

Objective To retrospectively analyze the therapeutic results of patients with initially di-agnosed metastatic nasopharyngeal carcinoma (NPC). Methods From January 1995 to December 1998, 46 NPC patients with distant metastases were treated in Fujian provincial cancer hospital. Among these pa-tients, 43 were single site metastasis and 3 were multiple sites metastases;The site of metastasis were 19 pa-tients in the liver, 11 in the bone, 7 in the lung, 1 in the brain, 6 in mediastinal nodes and 6 in axillary lymph nodes. All patients received standard radiotherapy to the primary site and cervical node region with a median dose of 72 Gy. Forty-one patients (89%) received 1-5 cycles chemotherapy (cisplatin and 5-flu-orouracil), and 23 (50%) received palliative irradiation to the metastatic site. Results The median surviv-al time was 20 months. The 1-, 2-, 3-year and 5-year overall survival rates were 66%, 47%, 30% and 19%, respectively. Irradiation to the metastatic sites and KPS were the significant prognostic factors. Pa-tients with palliative irradiation to the metastatic site had longer survival than those without (39 months vs. 13 months, X2=8.63, P=0.012). Patients with good performance status (KPS≥80) had better outcomes thanthose with poor performance status (26 months vs. 12 months, X2= 3.95, P=0.035) . Conclusions Active therapy may prolong the survival of patients with initially diagnosed metastatic NPC, especially for those who have good performance status. Under systematic chemotherapy, radiotherapy to the primary site and supportive care, the palliative irradiation to the metastatic site may also yield a good result.     

Accumulation of toxic metals (Pb and Cd) in the sea urchin Diadema aff. antillarum Philippi, 1845, in an oceanic island (Tenerife,Canary Islands)

This document shows the results obtained from a study on the concentration of toxic heavy metals in the internal tissue and exoskeleton of sea urchins, collected from their natural habitat. The levels of lead and cadmium were measured by Graphite Furnace Atomic Absorption Spectrometry. The mean concentrations of lead and cadmium in the internal tissue were 304.04 and 260.54 μg/kg respectively, whereas in the shell they were 185.02 and 142.48 μg/kg. We also performed a statistical analysis of the differences in the distribution of metals between their exoskeleton and their internal content, a correlation study of the metal content in internal tissue and shell and sampling areas, and a correlation study between the metal content and sample size. Since the sea urchin Diadema antillarum presents a wide range of variation in metal content, this study suggests that this species is an excellent bioindicator of heavy metal contamination. © 2009 Wiley Periodicals, Inc. Environ Toxicol, 2010.     

A study of the freeze-drying conditions of calixarene based solid lipid nanoparticles.

In this note, we report a study of cryoprotectant carbohydrate (glucose, fructose, mannose and maltose) effects on the reconstitution of calixarene based solid lipid nanoparticle (SLN) suspensions after freeze-drying, studied by atomic force microscopy and photon correlation spectroscopy. All carbohydrates tested showed excellent cryoprotection and redispersion properties with the calixarene based SLNs.     

Lack of developmental toxicity of D-003: a mixture of long-chain fatty acids in rats.

D-003 is a mixture of long-chain fatty acids isolated and purified from sugar cane wax, the major component of which is 1-octacosanoic acid and which possesses effective antiplatelet, antithrombotic and cholesterol-lowering effects. D-003 was suspended in 1% acacia gum solution, and given daily by gavage to rats at dose levels of 5, 100 and 1000 mg/kg/day on days 6 through 15 of gestation. Cyclophosphamide, serving as a positive control, was given at the dose of 50 mg/kg/day on day 15 of gestation. Evidence of maternal or developmental toxicity was not observed in the groups treated with D-003. Maternal clinical signs of toxicity were not observed and the analysis of initial body weight and the body weight gain during the treatment period was comparable among the groups treated with D-003 and control. As expected, cyclophosphamide caused both embryotoxic and teratogenic effects in rats. Meanwhile, no adverse effects on reproductive performance, or on embryonic or fetal development, including visceral and skeletal examination, were seen in any of the groups administered D-003. It is concluded that D-003 administered up to 1000 mg/kg/day did not induce any evidence of developmental toxicity.